Red Hills Lumber Select heart pine flooring is 80-100% heart and is sawed from the base log of selectively harvested mature longleaf pines - some over 200 years old. It is similar in heart content and ring density to heart pine harvested in the late 19th Century that makes up much of the reclaimed timber market today. Because of the rarity of this clear wood, it is produced in limited quantities. Many boards are completely clear, while some boards have infrequent small knots. It is a blend of both flatsawn and quartersawn (vertical) wood.